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Coach battery charging problem

I have 2006 CC 360 inspire and while driving the engine shows 14 volts but it doesn’t seem to be charging the coach batteries, any ideas where to look or how to fix??
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Re: Coach battery charging problem

Reply #1 –
Did this problem just start?
How are you measuring the coach battery voltage?  If you are using a system inside the coach it may be faulty.  But I will admit I have no idea what instruments you have in the coach. 
How old are your batteries?
Are your house batteries being charged when you drive?

Unless you are measuring the coach battery voltage at the batteries with a voltmeter I would suggest doing that just to make sure the battery voltage is really low.  If the voltage is low try checking and cleaning the connections.

The schematic for my coach shows there are no fuses or disconnects between the chassis batteries, starter, alternator or the boost solenoid.  All of these are wired directly together.  The problem with the schematic is that it does not show the actual wiring connections and I wouldn't know where to start looking for a bad connection.

Hope someone with your coach chimes in.
Pete
 2000 40'  Magna #5892  CAT C-10

Re: Coach battery charging problem

Reply #2 –
Newbie to this RV stuff.
When the engine is running it charges the starter battery fine, but it’s not changing the coach battery’s , maybe that’s the way it  supposed to work.  When the bus is plugged in chargers the coach battery fine.
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Re: Coach battery charging problem

Reply #3 –
Nope, the engine alternator is supposed to charge the coach batteries. I misunderstood your first post.  There is a solenoid someplace on your coach that is supposed to connect the coach and engine batteries together when the engine is running.  That solenoid (boost solenoid) is the same solenoid that is activated when you hold down the boost switch.  There is an oil pressure switch on the engine that also activates the solenoid when the engine is running.

There is a 300 amp fuse between the solenoid and the coach batteries but since those batteries are being charged when you are plugged into shore power that fuse is ok.

While running the engine, hold down the boost switch and see if the coach battery voltage increases.  If it does then the oil pressure switch may be faulty but many people report that the connection at the pressure switch on the engine just needs cleaning.

If the voltage does not increase when the boost switch is held down then in all likelihood the boost solenoid is faulty.  You can test the solenoid.  First find it.  If you don't know where it is have someone toggle the boost switch off and on and listen for the solenoid to click.  I doubt it is too far from one of the sets of batteries.  It should have at least two large red wires connected to the large terminals on it and several smaller wires connected to the two smaller terminals.

Once you've found the solenoid, start the engine and use a voltmeter to measure the voltage across the large terminals.  The reading should be zero or very close to zero and if it isn't the solenoid is probably faulty.  If the voltage is much greater than zero, say 1 or 2 volts or more then you know the solenoid isn't completing the circuit for charging the coach battery and the it should be replaced.



Pete
 2000 40'  Magna #5892  CAT C-10

Re: Coach battery charging problem

Reply #4 –
Ok thanks for the information I’ll see if I can find the solenoid your referring too.
Thanks again
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